last

英[lɑ:st] 美[læst]

n.last;end;last;shoe last (model for making shoes)

vt. Withstand; after...; enough; enough to maintain (especially for a certain period of time)

adj. The last; the nearest; the least likely; the only remaining one

vi.Continue

adv.Last; last time, most recent time

Third person singular: lasts Present participle: lasting Past tense: lasted Past participle: lasted

index

UK[ˈɪndeks] US[ˈɪnˌdɛks]

n.index;<number>index;indication;sign

vt .Index...;Index...;[Economics]Adjust by living index (wages, prices, etc.)

vi.[Mechanics]Transposition

Third person singular: indexes plural: indices indexes present participle: indexing past tense: indexed past participle: indexed

of

##英[əv] 美[ʌv]

prep.About;belonging to;made of

javascript lastIndexOf() method syntax

Function: Returns the last occurrence position of a specified string value, and searches from back to front at the specified position in a string.

Syntax: stringObject.lastIndexOf(searchvalue,fromindex)
Parameters: searchvalue Required. Specifies the string value to be retrieved. fromindex Optional integer parameter. Specifies the position in the string to begin searching. Its legal values ​​are 0 to stringObject.length - 1. If this parameter is omitted, the search will start from the last character of the string.

Return: If there is a searchvalue before the fromindex position in stringObject, the position of the last searchvalue that appears is returned.

Description: This method will retrieve the string stringObject from end to beginning to see if it contains the substring searchvalue. The starting position of the search is at fromindex of the string or at the end of the string (when fromindex is not specified). If a searchvalue is found, the position of the first character of searchvalue in stringObject is returned. Character positions in stringObject start from 0.

Note: lastIndexOf() method is case-sensitive! If the string value to be retrieved does not appear, the method returns -1.

javascript lastIndexOf() method example

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script type="text/javascript">

    var str="Hello world!"
    document.write(str.lastIndexOf("Hello") + "<br />")
    document.write(str.lastIndexOf("World") + "<br />")
    document.write(str.lastIndexOf("world"))

</script>

</body>
</html>

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